牙科锥形束CT中的图像伪影。
Image artifact in dental cone-beam CT.
作者信息
Katsumata Akitoshi, Hirukawa Akiko, Noujeim Marcel, Okumura Shinji, Naitoh Munetaka, Fujishita Masami, Ariji Eiichiro, Langlais Robert P
机构信息
Department of Oral Radiology, Asahi University School of Dentistry, Gifu, Japan.
出版信息
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2006 May;101(5):652-7. doi: 10.1016/j.tripleo.2005.07.027. Epub 2005 Nov 11.
PURPOSE
The purpose of this study was to investigate the appearance and possible cause of an artifact seen in limited-volume cone-beam CT imaging.
METHODS
A water-filled plastic cylinder was used as a phantom of the head. A test object was constructed as a bone-equivalent phantom to be imaged. The test object was variously positioned at the center of the phantom and near its margins. CT images of the test object were acquired using a 3DX Accuitomo system.
RESULTS
In slice images with the test object positioned near the margin of the phantom, arch-shaped defects or deformities were observed on the side of the object. There was a negative correlation between the artifact and the CT value of the object. The artifact was larger in images scanned with a higher voltage.
CONCLUSION
The probability that this artifact is caused by halation from the image intensifier (II) system is suggested.
目的
本研究旨在调查在有限体积锥形束CT成像中出现的一种伪影的表现及可能原因。
方法
使用一个装满水的塑料圆柱体作为头部模型。构建一个骨等效模型作为待成像的测试物体。将测试物体分别置于模型中心及其边缘附近。使用3DX Accuitomo系统获取测试物体的CT图像。
结果
在测试物体位于模型边缘附近的切片图像中，在物体一侧观察到拱形缺陷或变形。伪影与物体的CT值之间呈负相关。在较高电压扫描的图像中伪影更大。
结论
提示该伪影由图像增强器（II）系统的光晕引起的可能性。
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